MC908GR48ACFAE Freescale Semiconductor, MC908GR48ACFAE Datasheet - Page 109

• Manufacturer Part Number: MC908GR48ACFAE
• Description: IC MCU 48K FLASH 8MHZ 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908GR48ACFAE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 37
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Processor Series: HC08GR
• Core: HC08
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: ESCI/SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 53
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: FSICEBASE, DEMO908GZ60E, M68CBL05CE, M68EML08GPGTE
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 24-ch x 10-bit
• Controller Family/series: HC08
• No. Of I/o's: 37
• Ram Memory Size: 1.5KB
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Embedded Interface Type: SCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Chapter 8
External Interrupt (IRQ)
8.1 Introduction
The IRQ (external interrupt) module provides a maskable interrupt input.
8.2 Features
8.3 Functional Description
A low applied to the external interrupt pin can latch a central processor unit (CPU) interrupt request.
Figure 8-1
Interrupt signals on the IRQ pin are latched into the IRQ latch. An interrupt latch remains set until one of
the following actions occurs:
The external interrupt pin is falling-edge triggered out of reset and is software-configurable to be either
falling-edge or falling-edge and low-level triggered. The MODE bit in the INTSCR controls the triggering
sensitivity of the IRQ pin.
When an interrupt pin is edge-triggered only (MODE = 0), the interrupt remains set until a vector fetch,
software clear, or reset occurs.
When an interrupt pin is both falling-edge and low-level triggered (MODE = 1), the interrupt remains set
until both of these events occur:
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Features of the IRQ module include:
A dedicated external interrupt pin (IRQ)
IRQ interrupt control bits
Hysteresis buffer
Programmable edge-only or edge and level interrupt sensitivity
Automatic interrupt acknowledge
Internal pullup resistor
Vector fetch — A vector fetch automatically generates an interrupt acknowledge signal that clears
the latch that caused the vector fetch.
Software clear — Software can clear an interrupt latch by writing to the appropriate acknowledge
bit in the interrupt status and control register (INTSCR). Writing a 1 to the ACK bit clears the IRQ
latch.
Reset — A reset automatically clears the interrupt latch.
Vector fetch or software clear
Return of the interrupt pin to a high level
shows the structure of the IRQ module.
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
109